We design, fabricate, and characterize dual-band terahertz (THz) metamaterial absorbers with high absorption based on structures consisting of a cobalt silicide (Co-Si) ground plane, a parylene-C dielectric spacer, and a metal top layer. By combining two periodic metal resonators that couple separately within a single unit cell, a polarization-independent absorber with two distinct absorption peaks was obtained. By varying the thickness of the dielectric layer, we obtain absorptivity of 0.76 at 0.76 THz and 0.97 at 2.30 THz, which indicates the Co-Si ground plane absorbers present good performance.
© 2013 Optical Society of America
Original Manuscript: April 23, 2013
Manuscript Accepted: May 19, 2013
Published: June 25, 2013
Yongzheng Wen, Wei Ma, Joe Bailey, Guy Matmon, Xiaomei Yu, and Gabriel Aeppli, "Polarization-independent dual-band terahertz metamaterial absorbers based on gold/parylene-C/silicide structure," Appl. Opt. 52, 4536-4540 (2013)